насколько я поняла, сравниваются результаты пациентов в зависимости от количества полученного ими препарата железа (в ампулах) After adjusting for 23 demographic and comorbidity characteristics among 5833 patients included in multivariable analysis, bills for ≤10 vials of iron over 6 mo showed no adverse effect on survival (adjusted relative risk [RR] = 0.93; 95% confidence interval [CI], 0.84 to 1.02; P = 0.14) when compared with none, but bills for >10 vials showed a statistically significant elevated rate of death (adjusted RR = 1.11; 95% CI, 1.00 to 1.24; P = 0.05). Prescribing iron in quantities of ≤10 vials over 6 mo had no association with an elevated risk of death or rate of hospitalization. http://jasn.asnjournals.org/content/13/3/734.full.pdf
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